“…HAE most commonly affects the skin on the extremities, with the onset of symptoms usually in childhood. Other rare causes of isolated acute genital swelling reported in childhood included idiopathic lymphoedema, metastatic Crohn's disease , juvenile dermatomyositis , and fixed drug eruptions . Noncutaneous involvement of HAE, such as the gastrointestinal tract, brain, kidney, and pancreas, often causes a delay in diagnosis.…”